Method of polystation signaling.



PATENTED JAN. 8, 1907.

'W'. W. DEAN. METHOD OF POLYSTATION SIGNALING. APPLICATION FILED AUG.9,1905.

THE NORRIS Pia-15x5 0a., wnsnmammn c.

1'0 a/ZZ whom it may concern:

UNITED STATES PATENT OFFICE.

WILLIAMW. DEAN, OF ELYRIA, OHIO, ASSIGNOR To THE DEAN ELECTRIC COMPANY,or ELYRIA, OHIO, A CORPORATION OF OHIO.

METHOD OF POLYSTATION SIGNALING.

' Specification of Letters Patent,

Patented-T an. 8, 1907.

Original application filed May 19, 1905, Serial No. 261,1 82. Dividedand this application filed August 9, 1906. Sefial No. 273,460.

Be it known that I, WILLIAM W- DEAN, a citizen of the United States,residing at Elyria, in the'county of Lorain and State of Ohio, haveinvented certain new and useful Improvements in Methods of PolystationSignaling, of which the following is a specification, reference beinghad therein to the ac- 'companying drawings. My invention relates toelectrical signaling, and particularly to what is known as harmonic orselective ,signaling for telee disclosed in my 261,132, of which thepresent application is a division. I In such systems where more than onestation is served over a single line modern standard practice calls forthe employment of'signaling means by which one station may be called upwithout alarming the other or any'of the others, if there be several; Informer systems devised by me I have employed a number of tunedvibrating. reeds at the several stations, each reed responding to acertain frequency of alternating or intermittent current only. The reedsemployed constituted the clapper-rods of polarized ringers, and theclappers were adjusted to strike the gongs without the armaturestouchingthe pole-pieces. With such an arrangement the initial rate or period ofvibrationof each clapper-rbd is'somewhat modi-- fied by contact with thegongs, and-hence I' found it necessary to resort to undertuningorovertuning the current or the mechanical. parts in order that thecurrent throw upon the line to ring a particular station should:orrespond in periodicity to the modified or operativeperiodicity of thereed and clapper at thedesired" substation. My present invention, while,asd have. stated, it includes the feature of a tuned reed at eachstation, is an improvement in every way and is to be distinguished frommy former inventions bythe following. radically-different principle andmethod ofoperation; In'the former case I was forced to use gongs ofdifferent sizes, and it was necessary to have a very nice adjustment ofrelative ire uencies, as well as a careful adjustment 0 the movingmechan ical parts. In the present case I abandon all overtunihg andundertuning entirely and adjust my reed to respond .to its own naturalfrequency, and this being determined th current can be supplied at acorresponding frequency with absolute certainty. 11 order to overcomethe modifying effects of the first, a very stifl springmountin for thearmature. @11 clapper-rod; secon I expose the armature to acumulatively-increasing force as it vibrates, and, third, I expose thenaked pole-pieces to the ends of the armathe armature will strike itspole-piece before the clapper-rod touches the'g'ong, the clapper thenspringing over to strike the gong, and thus getting a very quick return.In practice the distance between the clapper and the gong may be, say,one thirty-second ofan inch. With this construction and adjust tone fromthe gongs and perfect certainty of of operation in selection. It will beobserved that my invention tus for practicing the method. In theprestures, such as 'a spring-mounting of the armature and the means fortuning b 'sliding the cla per up and down the rod; ut it is of these orany other specific limitations, being practicable with many differentforms of apparatus. I My invention will be fully understood upon readingthe following detailed description in connection with' the accompanyingdrawings, forming a part hereof, in which-: 1

I Figure 1 is aside view of a polarized signal .bell orringer'embodyingmy invention; Fig.

to t 'e right, and Fig. 3 is a perspective view removed.

Referring to the drawings, Q Q is a pair of ringer-magnets mounted uponthe yoke B, which also carries the bent permanent mag- "net M, as shown.The cores g g of the elec tromagnets protrude at the lower ends, andupon them or u on the sleeve surrounding is of non-magnetic materialextending from pole to pole and adjustably clamped thereto and havingfront andback downwardlym, for the reception of the studs d d ongong-strokes, I use three expedients-theture and so adjust the gongsthat each end of,

of the clapper-rod with its connected' .parts ment I get a very sharp,clear, and powerful really covers both a method and the appara ent caseI shall describe some specific feaquite o vious that my method isindependent -2 is section on the line 00 a: of Fig. 1 looking 'them iscarried t e armature-yoke A. This turned extensions (1 a slotted, asshown at the armature-support D. hese'studs are rod out of punchings, intwo halves, a

' the blanks these would termined, or, in other words,

opposite stroke,

'rected by securing the clapper c is exact pitchis reached which idesired. .01 course in making these bells in quantities it cumulativeforce soon formed upon the terminal blocks d d con the stiff springd,Whose ends are riveted or otherwise secured in slots in the blocks. Thestuds are threaded'and receive the nuts d (1 which clamp the extensionsof the yoke firmly upon the blocks (1 d thereby structure D in place.The armature C is formed integral with the clapperright'and a left. Ofcourse in making be all the same, but in forming up the right wouldbeturned one way and the left the other. Each left blank has a wing c, aleaf 0, and a long stem 0 Each right blank has a wing c, a leaf c and astem '0 In assembling these parts the spring (1 is placed. between thetwo leaves 0 and 0 which are riveted together through the spring. Thestems c and c are thenalso riveted together, and the cylindrical placedupon the rod thus produced. The ends of the spring (1 being secured inthe blocks al d the structure of 3 is com lete and is read forassembling in'the comp ete ringer, as s own in Figs. 1 and 2. Myselective reed is thus formed of the parts D and C, and its exact periodis de it is tuned by up or down until the moving the clapper c ispossible to determine the exact point upon the clapper-rod upon whichthe clapper of a given Wei ht must be placed to give the desired resu t.v

In operation when current of any particu lar frequency is thrown uponthe. line the reed or clapperrod of corresponding period will commenceto buzz, and as it buzzes' the armature-wings c 0- will approach to andrecede from. the pole-pieces g During each approach and recession theamplitude of vibration isv increased, and the force exerted by thepole-pieces is increased corre spondingly. .Ac'tion and reaction thus'succeeding and reinforcing each the other, the causes one armature endtoforcibly strike its pole-piece, whereupon it will stop; but theclapper 0 will continue its'travel, the clapper-rod'C springing topermit this. The clapper strikes the gong and instantly recoils. Allthis on account of the magnitude of the cumulative force at the time ofstroke is accomplished substantially in the natural period of the parts.Hence the recoil from one side stroke assists in the or, to put itanother way, energy'is stored up in the yielding clapper C to snap backand start the next stroke, the innate capabilities of all the parts beinthus utilized and current, spring, and stro c all acting well together.

In order that the adjustment of the gongs may be not only accurate butpermanent, I mount each gong G or G upon a post 9 or g,

I without any overthrow -ticed.that is 'to say,

ward end to engage a worm w or w. Each worm has a head W or W, and itsshank is mounted to turn in drop-bearings b 6, formed upon the yoke B.By means of a wrench the worms can be turned 'to adjust thegongsexactly,

ordinary use or misuse will move them.

It will be apparent from the foregoing description that my methodconsists in exact tuning, but -mechanical overthrow, ascontradistinguish'ed from exact adjustment but with 'overtuning. Thepresent method may be stated in a few words, as follows: A reed iscumula tively flexed to store up energy, the point of reversal orcut-off of the energy bein determined at this mechanism, leaving t ereed or moving body to give the actual stroke and to take thecorresponding recovery by means of the stored energy thus suddenlyconcentrated and released. It will be observed that the instantaneousstroke is of great importance. The'sudden stoppage of theenergizing-armature is of importance in order to give this instantaneousstroke, and the use of stiff and normally unresponsive parts is ofimportance in order to prevent the storing up of energy in beats offrequency called for. It is to be observed that I make the spring dstiff, and by reason of the cross-connection thereon of the leaves ofthe armature there is a torsional that is to say, a verystrongresistance to the first movements on the partof the armature. Thespring (1 itself maybe tuned like a reed; but whether it is or not it isso stiff that no momentary current impulses will budge the armature,this only being accomplished by the normal increments of the properperiodic currents.

I am aware that there are many changes in detail that. may .be made inthe invention 'thus described without departing from the any but theparticular and when so adjusted no spirit or the principles involved,and I wish 1t understood quite clearly that I do not limit myself to thespecific form shown for my ringer, but include within the scope of theclaims which I shall make all possible forms by which the invention maybe pracby which the principles upon which I rely may be incorporated andbrought under control.

Having thus described my invention, what I claim, and desire to secureby'Le'tters Patent, is I a l. The method of selective, harmonicsignaling, which consists in vibrating a tuned body by means of periodicincrements of energy, causing said energyto be stored in said body untila desired totality is reached,then, instantaneously interrupting thevibration and utilizing the stored energy to flex the l body to producea stroke of such short duration as not appreciably to retard or alterthe normal or periodic movement of the vibrating body.

2. The method of selective, harmonic signaling which comprises thefollowing steps: communicating to astifi tuned reed, successive, smallincrements of periodic-energy of proper frequency and thereby raising itfrom a state of inaction to a state of active vibration, storing upenergy in said reed, andvibrating the same with gradually-increasingamplitudes, and finally at the point of'maximum amplificationinterposing a positive stop to render dead a portion of the vibratingwhereby the entire cumulareed structure tive energy will be impartedsuddenly to the remainderof the reed structure to roduce a stroke orsounding movement at sue accelerated velocity as not .to retard or,alter the normal periodic vibration of the reed structure as a whole.

is utilized to flex the body to produce a stroke of such short durationthat the retardation or alteration ofthe natural rate of vibration isrendered ne ligible,

In testimony whereofl affix my signature in presence of two witnesses.

WILLIAM w. DEAN.

Witnesses:

A. D. T. LIBBY, I Gno'. A.-Scov1:LLE.

' said vibration, whereby the stored-up energy w

